Kathleen lost a tooth today. Now she has lost 4 more than her sister Cara lost. Write an expression to represent the number of teeth Cara has lost. Let represent the number of teeth Kathleen lost. Expression:

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar(s). line m has no y-intercept, and its x-intercept is (3, 0). line n has no x-intercept, and its y-intercept is (0, -4). the equation of line m is , and the equation of line n is .